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D_App D_Pre-Development Model NY-West Seneca 24-hr S1 10-yr Rainfall=3.14" Prepared by Labella Associates Printed 4/17/2026 HydroCAD® 10.20-7a s/n 09581 © 2025 HydroCAD Software Solutions LLC Page 10 Summary for Subcatchment ES-1: W Site Runoff = 12.32 cfs @ 12.15 hrs, Volume= 0.961 af, Depth= 1.49" Routed to Reach AP-1 : Cayuga Creek Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NY-West Seneca 24-hr S1 10-yr Rainfall=3.14" Area (sf) CN Description 38,223 98 Paved parking, HSG D 298,971 80 >75% Grass cover, Good, HSG D 337,194 82 Weighted Average 298,971 88.66% Pervious Area 38,223 11.34% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.5 100 0.0450 0.20 Sheet Flow, SF Grass: Short n= 0.150 P2= 2.20" 5.3 271 0.0148 0.85 Shallow Concentrated Flow, SCF Short Grass Pasture Kv= 7.0 fps 0.2 20 0.1500 1.94 Shallow Concentrated Flow, SCF Woodland Kv= 5.0 fps 14.0 391 Total Subcatchment ES-1: W Site Hydrograph Runoff 13 12.32 cfs 12 NY-West Seneca 24-hr S1 10-yr 11 Rainfall=3.14" 10 Runoff Area=337,194 sf Runoff Volume=0.961 af 9 Runoff Depth=1.49" 8 Flow (cfs) Flow Length=391' 7 Tc=14.0 min 6 CN=82 5 4 3 2 1 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) Page 186 of 359